ACHIP+ workshop
FLASH Seminar room
DESY
Welcome to the first ACHIP+ workshop at Deutsches Elektronen-Synchrotron DESY in Hamburg, Germany on March 18th and 19th 2024. This workshop is in continuation of the Accelerator on a Chip International Program (ACHIP) which was funded by Gordon and Betty Moore Foundation (www.achip.stanford.edu).
We aim to continue and expand the international collaboration in research on laser-illuminated dielectric micro-structures as charged particle accelerators, diagnostic devices and photon sources.
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08:00
coffee
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DLA - Theory and DesignConvener: Willi Kuropka (MPY1 (MPY Fachgruppe 1))
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1
Welcome
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2
DLA-PINEM physics and efficient acceleration
PINEM, the exchange of photons with a given electron, could be regarded as the fundamental effect governing DLA in the quantum regime. Understanding PINEM physics is an excellent approach to thinking about more efficient DLA structures. I will discuss the link between PINEM and DLA in detail, towards higher-gradient acceleration
Speaker: Roy Shiloh (FAU Erlangen-Nuremberg) -
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ML-based control and optimization of DLA experiments
The experimental complexity of DLA experiments increases with increasing structure length and the utilization of more complex laser pulse shapes, such as pulse front tilts. Consequently, the experiments involve many parameters demanding careful control and optimization. Previous studies have demonstrated the efficacy of machine learning (ML) in enhancing the performance of conventional accelerators. In this presentation, I will introduce our research project funded by the BMBF, which aims to implement a machine learning-based control system. This system is designed to reconstruct, analyze and optimize the laser pulse shape used for DLA experiments at ARES, leveraging electron beam diagnostics after the DLA interaction.
Speaker: Thilo Egenolf (TEMF, TU Darmstadt)
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1
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10:30
coffee break
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DLA - ExperimentsConvener: Dr Frank Mayet (MPY1 (MPY Fachgruppe 1))
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4
Sub-relativistic Alternating Phase Focusing Dielectric Laser Accelerators
We present our results for the design, fabrication, and testing of silicon-based, sub-relativistic Dielectric Laser Accelerators (DLAs) which use optical near fields to accelerate and confine electrons over extended distances. We describe how Alternating Phase Focusing (APF) lattices are incorporated to longitudinally/transversely focus/defocus electrons in an alternating fashion based on electron-laser interaction phase. Alternating between ±60° off-crest synchronous phases enables us to operate at half the peak acceleration gradient while also imparting strong confinement forces, ultimately extending interaction lengths up to 708 μm and achieving energy gains up to 23.7 ± 1.07 keV FWHM. We also highlight future directions for three-dimensional confinement, bunching, and quantum behavior of electrons in DLAs.
Speaker: Melanie Murillo (Stanford University) -
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Dielectric Laser Acceleration - state of the art and recent sub-relativistic experimentsSpeaker: Stefanie Kraus (Chair for Laserphysics FAU Erlangen)
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6
Dielectric Laser Acceleration with Relativistic Beams - Recent Results at ARES
In this talk the DLA-related experiments at the SINBAD/ARES linear accelerator at DESY are presented. Both recent results, as well as future plans are discussed.
Speaker: Dr Frank Mayet (MPY1 (MPY Fachgruppe 1)) -
7
Extended Interaction Length Laser-Driven Acceleration in a Tunable Dielectric Structure
The development of long, tunable structures is critical to increasing energy gain in laser-driven dielectric accelerators (DLAs). Here we combine pulse-front-tilt illumination with slab-geometry structures assembled by precisely aligning off-the-shelf 4~mm long transmission gratings to achieve up to 200 keV energy modulation for 6 MeV injected electrons. The effective interaction length is longer than 1~mm, limited by dephasing of the accelerated particles in the structure. The piezo-based independent mounting system for the gratings allows tuning of the gap and field distribution inside the structure.
Speaker: Sophie Crisp (UCLA)
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4
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13:00
lunch break
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Synergistic Optical Approaches - AccelerationConvener: Stefanie Kraus (Chair for Laserphysics FAU Erlangen)
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8
Title TBDSpeaker: Huaixin Yang (Chinese Academy of Sciences)
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9
Terahertz AccelerationSpeaker: Franz Kaertner (FS-CFEL-2 (Ultrafast X-rays Group))
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10
Acceleration, compression and timing stabilisation of relativistic beams with THz pulsesSpeaker: Steven Jamison (Lancaster Univ)
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11
Lossless electron monochromator in an ultrafast TEM using near-field THz radiationSpeakers: Ido Kaminer (Technion), Yuval Adiv
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8
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16:00
coffee break
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16:30
Discussion Session
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18:30
Workshop Dinner - Elbspeicher Hamburg
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08:00
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08:00
coffee
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Synergistic Optical Approaches - LasersConvener: Pietro Musumeci (UCLA)
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12
Key issues in the development of inverse-Cherenkov dielectric laser acceleratorsSpeaker: Weihao Liu (Chinese Academy of Sciences)
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13
Laser-based electron beam shaping: from facilities to the nanoscaleSpeaker: Sergio Carbajo (SLAC National Accelerator Laboratory)
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14
Optical design of waveguides and adapters for extended dielectric accelerating structuresSpeaker: Giuseppe Torrisi (INFN Catania)
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12
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10:00
coffee break
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Radiation, Smith Purcell, THzConvener: Joel England (SLAC)
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15
The European EIC TWAC Project on Terahertz Dielectric Acceleration - Christelle Bruni, Eleonore RousselSpeakers: Christelle Bruni (Lille University), Eleonore Roussel (Lille University)
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16
Free electron-driven nanomaterials for versatile X-ray generation and quantum scienceSpeaker: Wong Liang Jie (NTU Singapore)
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17
Opportunities of ACHIP nano-bunches for high-brightness radiation and high-resolution inspectionSpeaker: Yen-Chieh Huang (National Tsinghua University)
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18
Nanophotonic Travelling Wave Tube
In the first part of the talk I will briefly review the literature on Smith–Purcell Free Electron Lasers, and speculate about the possibility of scaling down a radio wave amplifier: coupled-cavity Travelling Wave Tube, to obtain a light-generating device based on nanostructures. In the second part of the talk I will show concrete numerical results on Cherenkov Diffraction Radiation: the Fabry–Perot effect for the evanescent wave, and the anti-reflection layer for the evanescent wave.
Speaker: Andrzej Szczepkowicz (University of Wroclaw)
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15
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12:30
lunch break
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ApplicationsConvener: Hueseyin Cankaya (FS-LA (FLASH 2020+ flexible pump probe lasers))
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19
Electron-Atom scattering with attosecond bunched pulsesSpeaker: Yuya Morimoto (Friedrich-Alexander-Universität Erlangen-Nürnberg)
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21
REGAE: Ultrafast electron diffractionSpeaker: Alke Meents (FS-CFEL-1-BMX (FS-CFEL-1 Fachgruppe BMX))
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22
DLA for Dark Matter SearchSpeaker: Raziyeh Dadashi Motlagh
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19
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16:00
coffee break
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16:30
Discussion Session
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17:30
ARES tour
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08:00